Circular Motion

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Transcript of Circular Motion

Circular Motion - Ch. 6.2Centripetal AcclerationSince the acceleration vector of an object in uniform circular motion points in towards the center, its acceleration is named Centripetal (or "center-seeking") Acceleration.Centripetal Force There must be some physical force pushing or pulling the object towards the center of the circle. This is the centripetal force requirement. RecapObjects must accelerate to travel in circular motion.The net force required to cause an object to accelerate in circular motion is called the centripetal forceCentripetal literally means "center-seeking" because the net force of an object traveling in circular motion must be directed inward.Uniform Circular Motion:-Speed is constant-Direction is changingAcceleration and UCMUniform Circular MotionIs an object in uniform circular motion accelerating?Acceleration and UCMWhat is this acceleration called?Centripetal AccelerationWhere ac = centripetal acceleration (m/s2)v = tangential speed (m/s)r = radius (m)"Forces cause Accelerations"So, if an object in uniform circular motion is accelerating, it must have some net force acting on it. What's that called?We are not introducing a new type of force but rather describing the direction of the NET FORCE acting upon the object . If an object moves in a circle, there is some net fo acting upon it to cause it to deviate from its straight-line path, accelerate inwards and move along a circular path.Centripetal ForceSo, for an object in uniform circular motion, Newton's Second Law get's restated as:Where Fc = Centripetal Force (N)m = mass (kg)ac = centripetal acceleration (m/s2)*This equation is derived on p. 154 of your text.TopicsName that centripetal forceAny curve will doSquish the jellyCentrifugal forceThe loop-the-loopQuestions?Name that Centripetal ForceAny Curve will doSquish the Jellyhttp://www.physicsclassroom.com/mmedia/circmot/rht.cfmThe vertical loop-the-loopCentrifugal ForceName given to the force which seems to act outward on objects undergoing circular motion.For an inertial frame of reference - this is a nonexistent or "fictitious" force.Questions?Yes!This is the acceleration required for an object to complete circular motion